Item analysis on the general module in a multidimensional health measurement scale for elderly pa-tients with chronic diseases
Objective To analyze and evaluate the items of the general module of multidimensional health measurement instruments system for elderly patients with chronic disease(MHIEC-GM)(V1.0)based on classical test theory(CTT)and item response theory(IRT).Methods A self-administered sur-vey of 2 375 elderly patients with chronic diseases was conducted using the MHIEC-GM(V1.0)scale.The quality of items was analyzed using the variability method,correlation coefficient method,factor analysis method,and Cronbach's α coefficient method based on CTT.The difficulty coefficient,differentiation coeffi-cient,and information content of items were analyzed using the IRT analysis software MULTILOG 7.03.Re-sults The CTT results showed that the standard deviations of all nine items were greater than 0.9.The re-sults of the correlation coefficient method,the factor analysis method and the Cronbach's α coefficient method showed that except for the GMI9 item,the correlation coefficients between the other items and the total scale were all greater than 0.5,and the factor loads were all greater than 0.5,and the Cronbach's α coefficients af-ter the deletion of the items were all less than 0.763.Based on the results of the four analysis methods,ex-cept for the GMI9 item,all the other items had good characteristics.The IRT results showed that the informa-tion contents of all items were＞0.333(5/15)except for the GMI4,GMI6,and GMI8,and the differentiation coefficient of each item was 1.44.The items that difficulty coefficient met the[-4,4]inclusion criteria were the GMI2,GMI3,GMI5,GMI7 and GMI9,showing a monotonically increasing trend with increasing dif-ficulty level.The items of GMI1,GMI4,GMI6,and GMI8 needed further improvement.Conclusion Most of items of the MHIEC-GM(V1.0)scale have good psychometric properties,but some items need to be fur-ther revised and validated according to the characteristics of chronic diseases in the elderly.
ElderlyChronic diseaseMultidimensional healthClassical test theoryItem response theory
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NSTL
万方数据
